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          JS实现商城排序
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        <h2 id="实现效果"><a href="#实现效果" class="headerlink" title="实现效果"></a>实现效果</h2><ul>
<li>根据上架时间/热度/价格进行升序/降序排序</li>
<li>上箭头亮代表升序，下箭头亮代表降序</li>
</ul>
<a id="more"></a>

<p><img data-src="https://img-blog.csdnimg.cn/20201220203345422.gif" alt="商城排序"></p>
<h3 id="渲染-li-标签"><a href="#渲染-li-标签" class="headerlink" title="渲染 li 标签"></a>渲染 li 标签</h3><ul>
<li>获取 ul 以便让每一个 li 渲染到页面</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> lists = <span class="built_in">document</span>.querySelector(<span class="string">&quot;.lists&quot;</span>);</span><br><span class="line"><span class="keyword">var</span> lis = <span class="literal">null</span>;</span><br></pre></td></tr></table></figure>

<ul>
<li><p>把每一个 li 渲染到页面上</p>
<p>这里为了操作方便，给每一个 li 绑定自定义属性，之后根据属性值获取其中内容 <code>li.getAttribute(...)</code> 即可</p>
<p>如果不这样做，则需要通过 <code>li.querySelector(...).innerText</code> 获取</p>
<p><strong>注意：</strong><code>querySelectorAll</code> 获取到的是类数组，因为需要进行排序，使用数组的 sort() 方法，所以需要用 <code>[].slice.call()</code> 或 <code>Array.from</code> 转换成数组</p>
</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">Init</span>(<span class="params">data</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> str = <span class="string">&quot;&quot;</span>;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; data.length; i++) &#123;</span><br><span class="line">        <span class="keyword">const</span> el = data[i];</span><br><span class="line">        str += <span class="string">`&lt;li time=&quot;<span class="subst">$&#123;el.time&#125;</span>&quot; hot=&quot;<span class="subst">$&#123;el.hot&#125;</span>&quot; price=&quot;<span class="subst">$&#123;el.price&#125;</span>&quot;&gt;</span></span><br><span class="line"><span class="string">        &lt;img src=&quot;<span class="subst">$&#123;el.img&#125;</span>&quot; alt=&quot;&quot;&gt;</span></span><br><span class="line"><span class="string">        &lt;p class=&quot;title&quot;&gt;<span class="subst">$&#123;el.title&#125;</span>&lt;/p&gt;</span></span><br><span class="line"><span class="string">        &lt;p class=&quot;time&quot;&gt;<span class="subst">$&#123;el.time&#125;</span>&lt;/p&gt;</span></span><br><span class="line"><span class="string">        &lt;p class=&quot;info&quot;&gt;</span></span><br><span class="line"><span class="string">            &lt;span class=&quot;price&quot;&gt;<span class="subst">$&#123;el.price&#125;</span>&lt;/span&gt;</span></span><br><span class="line"><span class="string">            &lt;span class=&quot;hot&quot;&gt;<span class="subst">$&#123;el.hot&#125;</span>&lt;/span&gt;</span></span><br><span class="line"><span class="string">        &lt;/p&gt;</span></span><br><span class="line"><span class="string">    &lt;/li&gt;`</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    lists.innerHTML = str;</span><br><span class="line">    lis = [].slice.call(lists.querySelectorAll(<span class="string">&quot;li&quot;</span>));</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="点击-a-标签进行排序"><a href="#点击-a-标签进行排序" class="headerlink" title="点击 a 标签进行排序"></a>点击 a 标签进行排序</h3><ul>
<li>获取 a 标签</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> links = <span class="built_in">document</span>.querySelectorAll(<span class="string">&quot;.top a&quot;</span>);</span><br></pre></td></tr></table></figure>

<ul>
<li><p>给 a 标签添加鼠标点击事件</p>
<p>为实现每次排序都是上一次的倒序，需要给每一个 a 标签添加一个自定义属性作为标志 <code>links[i].flag = -1</code> ，flag 值为1代表升序，每次点击事件只需 flag 取反即可 <code>this.flag *= -1</code></p>
<p><strong>注意：</strong> sort() 方法中回调函数 this 指向 window，所以需要用一个变量存储 this <code>let that = this;</code></p>
</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; links.length; i++) &#123;</span><br><span class="line">    links[i].flag = -<span class="number">1</span>;</span><br><span class="line">    links[i].onclick = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">        <span class="built_in">this</span>.flag *= -<span class="number">1</span>;</span><br><span class="line">        <span class="keyword">let</span> that = <span class="built_in">this</span>;</span><br><span class="line">        <span class="keyword">let</span> sortFlag = <span class="built_in">this</span>.getAttribute(<span class="string">&quot;sortFlag&quot;</span>);</span><br><span class="line">        <span class="keyword">if</span> (sortFlag == <span class="string">&quot;time&quot;</span>) &#123;</span><br><span class="line">            lis.sort(<span class="function"><span class="keyword">function</span> (<span class="params">a, b</span>) </span>&#123;</span><br><span class="line">                <span class="keyword">return</span> (a.getAttribute(sortFlag).replace(<span class="regexp">/-/g</span>, <span class="string">&quot;&quot;</span>) - b.getAttribute(sortFlag).replace(<span class="regexp">/-/g</span>, <span class="string">&quot;&quot;</span>)) * that.flag;</span><br><span class="line">            &#125;);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            lis.sort(<span class="function"><span class="keyword">function</span> (<span class="params">a, b</span>) </span>&#123;</span><br><span class="line">                <span class="keyword">return</span> (a.getAttribute(sortFlag) - b.getAttribute(sortFlag)) * that.flag;</span><br><span class="line">            &#125;);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; lis.length; i++) &#123;</span><br><span class="line">            lists.appendChild(lis[i])</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">&#125;</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h3 id="点击-a-标签点亮排序箭头"><a href="#点击-a-标签点亮排序箭头" class="headerlink" title="点击 a 标签点亮排序箭头"></a>点击 a 标签点亮排序箭头</h3><ul>
<li>升/降序高亮对应箭头字体图标</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> arrows = <span class="built_in">this</span>.querySelectorAll(<span class="string">&quot;b&quot;</span>);</span><br><span class="line"><span class="keyword">let</span> arrCur = <span class="built_in">document</span>.querySelectorAll(<span class="string">&quot;.top b.current&quot;</span>);</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; arrCur.length; i++) &#123;</span><br><span class="line">    arrCur[i].classList.remove(<span class="string">&quot;current&quot;</span>);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">if</span> (<span class="built_in">this</span>.flag == <span class="number">1</span>) &#123;</span><br><span class="line">    arrows[<span class="number">0</span>].classList.add(<span class="string">&quot;current&quot;</span>);</span><br><span class="line">&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">    arrows[<span class="number">1</span>].classList.add(<span class="string">&quot;current&quot;</span>);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h3 id="优化"><a href="#优化" class="headerlink" title="优化"></a>优化</h3><ul>
<li>for 每进行一次循环都会引起浏览器的回流，非常耗性能</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; lis.length; i++) &#123;</span><br><span class="line">    lists.appendChild(lis[i]);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ul>
<li><p>可以使用 <code>DocumentFragment</code> 来创建一个新的空白的文档片段，把元素附加到这个文档片段中，之后通过这个文档片段附加到 DOM 树</p>
<p>因为<strong>文档片段存在内存中</strong>，并不在 DOM 树中，所以将子元素插入到文档片段时不会引起页面回流。因此，使用文档片段会带来更好的性能</p>
</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> frg = <span class="built_in">document</span>.createDocumentFragment();</span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; lis.length; i++) &#123;</span><br><span class="line">    frg.appendChild(lis[i]);</span><br><span class="line">&#125;</span><br><span class="line">lists.appendChild(frg)</span><br></pre></td></tr></table></figure>

<ul>
<li>如果希望点击完当前a标签，再点击其他a标签时都是升序排列的话，需要每次都将其他标签的flag设置为 -1</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; links.length; i++) &#123;</span><br><span class="line">    <span class="keyword">if</span> (links[i] != <span class="built_in">this</span>) &#123;</span><br><span class="line">        links[i].flag = -<span class="number">1</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="完整代码"><a href="#完整代码" class="headerlink" title="完整代码"></a>完整代码</h2><h3 id="index-html（html-css）"><a href="#index-html（html-css）" class="headerlink" title="index.html（html+css）"></a>index.html（html+css）</h3><ul>
<li>创建 <code>index.html</code> 文件，粘贴如下代码</li>
</ul>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">&quot;UTF-8&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">name</span>=<span class="string">&quot;viewport&quot;</span> <span class="attr">content</span>=<span class="string">&quot;width=device-width, initial-scale=1.0&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>商城排序<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">style</span>&gt;</span></span><br><span class="line">        * &#123;</span><br><span class="line">            margin: 0;</span><br><span class="line">            padding: 0;</span><br><span class="line">        &#125;</span><br><span class="line">        ul &#123;</span><br><span class="line">            list-style: none;</span><br><span class="line">        &#125;</span><br><span class="line">        a &#123;</span><br><span class="line">            text-decoration: none;</span><br><span class="line">        &#125;</span><br><span class="line">        body, html &#123;</span><br><span class="line">            background: lavender;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.main</span> &#123;</span></span><br><span class="line">            width: 1185px;</span><br><span class="line">            margin: 0 auto;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.main</span> <span class="selector-class">.topBar</span> &#123;</span></span><br><span class="line">            height: 50px;</span><br><span class="line"><span class="css">            <span class="selector-tag">background</span>: <span class="selector-id">#fff</span>;</span></span><br><span class="line">            display: flex;</span><br><span class="line">            align-items: center;</span><br><span class="line">            padding-left: 20px;</span><br><span class="line">            box-sizing: border-box;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.main</span> <span class="selector-class">.shortBtn</span> &#123;</span></span><br><span class="line">            display: flex;</span><br><span class="line">            align-items: center;</span><br><span class="line">            margin: 0 10px;</span><br><span class="line">            color: blue;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.main</span> <span class="selector-class">.shortBtn</span> <span class="selector-class">.arrows</span> &#123;</span></span><br><span class="line"><span class="css">            <span class="selector-tag">color</span>: <span class="selector-id">#333</span>;</span></span><br><span class="line">            display: flex;</span><br><span class="line">            flex-direction: column;</span><br><span class="line">            margin-left: 10px;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.main</span> <span class="selector-class">.shortBtn</span> <span class="selector-class">.iconfont</span> &#123;</span></span><br><span class="line">            font-size: 14px;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.shortBtn</span><span class="selector-pseudo">:hover</span>&gt;<span class="selector-tag">span</span> &#123;</span></span><br><span class="line">            color: red;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.lists</span> &#123;</span></span><br><span class="line">            display: flex;</span><br><span class="line">            flex-wrap: wrap;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.lists</span> <span class="selector-tag">li</span> &#123;</span></span><br><span class="line">            margin-top: 20px;</span><br><span class="line">            width: 225px;</span><br><span class="line"><span class="css">            <span class="selector-tag">background</span>: <span class="selector-id">#fff</span>;</span></span><br><span class="line">            padding: 20px;</span><br><span class="line">            box-sizing: border-box;</span><br><span class="line">            font-size: 14px;</span><br><span class="line">            margin-right: 15px;</span><br><span class="line">            line-height: 30px;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.lists</span> <span class="selector-tag">li</span><span class="selector-pseudo">:nth-child(5n)</span>&#123;</span></span><br><span class="line">            margin-right: 0;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.lists</span> <span class="selector-tag">li</span> <span class="selector-tag">img</span> &#123;</span></span><br><span class="line">            width: 140px;</span><br><span class="line">            display: block;</span><br><span class="line">            margin: 0 auto;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.lists</span> <span class="selector-tag">li</span> <span class="selector-class">.numInfo</span> &#123;</span></span><br><span class="line">            display: flex;</span><br><span class="line">            justify-content: space-between;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.arrowUp</span> &#123;</span></span><br><span class="line"><span class="css">            <span class="selector-tag">border</span>: 5<span class="selector-tag">px</span> <span class="selector-tag">solid</span> <span class="selector-id">#333</span>;</span></span><br><span class="line">            margin-bottom: 10px;</span><br><span class="line"><span class="css">            <span class="selector-tag">border-color</span>: <span class="selector-tag">transparent</span> <span class="selector-tag">transparent</span> <span class="selector-id">#333</span> <span class="selector-tag">transparent</span>;</span></span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.arrowUp</span><span class="selector-class">.current</span> &#123;</span></span><br><span class="line">            border-color: transparent transparent red transparent;</span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.arrowDown</span> &#123;</span></span><br><span class="line"><span class="css">            <span class="selector-tag">border</span>: 5<span class="selector-tag">px</span> <span class="selector-tag">solid</span> <span class="selector-id">#333</span>;</span></span><br><span class="line"><span class="css">            <span class="selector-tag">border-color</span>: <span class="selector-id">#333</span> <span class="selector-tag">transparent</span> <span class="selector-tag">transparent</span> <span class="selector-tag">transparent</span>;</span></span><br><span class="line">        &#125;</span><br><span class="line"><span class="css">        <span class="selector-class">.arrowDown</span><span class="selector-class">.current</span> &#123;</span></span><br><span class="line">            border-color: red transparent transparent transparent;</span><br><span class="line">        &#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">style</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;main&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;topBar&quot;</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">span</span>&gt;</span>排序<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span> <span class="attr">class</span>=<span class="string">&quot;shortBtn&quot;</span> <span class="attr">sortFlag</span>=<span class="string">&quot;time&quot;</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">span</span>&gt;</span>上架时间<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;arrows&quot;</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">b</span> <span class="attr">class</span>=<span class="string">&quot;arrowUp&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">b</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">b</span> <span class="attr">class</span>=<span class="string">&quot;arrowDown&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">b</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span> <span class="attr">class</span>=<span class="string">&quot;shortBtn&quot;</span> <span class="attr">sortFlag</span>=<span class="string">&quot;hot&quot;</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">span</span>&gt;</span>热度<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;arrows&quot;</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">b</span> <span class="attr">class</span>=<span class="string">&quot;arrowUp&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">b</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">b</span> <span class="attr">class</span>=<span class="string">&quot;arrowDown&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">b</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">a</span> <span class="attr">href</span>=<span class="string">&quot;javascript:;&quot;</span> <span class="attr">class</span>=<span class="string">&quot;shortBtn&quot;</span> <span class="attr">sortFlag</span>=<span class="string">&quot;price&quot;</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">span</span>&gt;</span>价格<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;arrows&quot;</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">b</span> <span class="attr">class</span>=<span class="string">&quot;arrowUp&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">b</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">b</span> <span class="attr">class</span>=<span class="string">&quot;arrowDown&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">b</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">a</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 图片列表 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">ul</span> <span class="attr">class</span>=<span class="string">&quot;lists&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">ul</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span> <span class="attr">src</span>=<span class="string">&quot;index.js&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h3 id="data-json"><a href="#data-json" class="headerlink" title="data.json"></a>data.json</h3><ul>
<li>这里需要用 Ajax 请求一下如下 json 数据</li>
<li>创建 <code>data.json</code> ，粘贴如下数据</li>
</ul>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br></pre></td><td class="code"><pre><span class="line">[</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">1</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI全网通版（亮黑色）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">499</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2017-03-15&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">198</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/1.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">2</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI（曜石黑）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">129</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2017-02-08&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">25</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/2.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">3</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;华为畅享7（香槟金）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">895</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2017-01-25&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">568</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/3.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">4</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI全网通版（曜石黑）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">1895</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2016-12-30&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">20000</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/4.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">5</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI全网通版（玫瑰金）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">3587</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2016-01-30&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">1032654</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/5.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">6</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;华为畅享7（香槟金）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">992</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2018-01-01&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">1</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/6.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">7</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI全网通版（樱语粉）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">564</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2017-02-19&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">400</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/7.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">8</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI全网通版（曜石黑）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">420</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2017-01-25&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">240</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/8.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">9</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI P10（钻雕金）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">12</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2014-01-01&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">12345678</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/9.jpg&quot;</span></span><br><span class="line">    &#125;,</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="string">&quot;id&quot;</span>: <span class="number">10</span>,</span><br><span class="line">        <span class="string">&quot;title&quot;</span>: <span class="string">&quot;HUAWEI全网通版（曜石黑）&quot;</span>,</span><br><span class="line">        <span class="string">&quot;price&quot;</span>: <span class="number">420</span>,</span><br><span class="line">        <span class="string">&quot;time&quot;</span>: <span class="string">&quot;2017-01-25&quot;</span>,</span><br><span class="line">        <span class="string">&quot;hot&quot;</span>: <span class="number">240</span>,</span><br><span class="line">        <span class="string">&quot;img&quot;</span>: <span class="string">&quot;img/8.jpg&quot;</span></span><br><span class="line">    &#125;</span><br><span class="line">]</span><br></pre></td></tr></table></figure>

<h3 id="index-js"><a href="#index-js" class="headerlink" title="index.js"></a>index.js</h3><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 获取页面元素</span></span><br><span class="line"><span class="keyword">let</span> lists = <span class="built_in">document</span>.querySelector(<span class="string">&quot;.lists&quot;</span>);</span><br><span class="line"><span class="keyword">let</span> links = <span class="built_in">document</span>.querySelectorAll(<span class="string">&quot;.topBar a&quot;</span>);</span><br><span class="line"><span class="keyword">let</span> lis = lists.getElementsByTagName(<span class="string">&quot;li&quot;</span>);</span><br><span class="line"><span class="comment">// Ajax 请求数据</span></span><br><span class="line"><span class="keyword">let</span> data = <span class="literal">null</span>;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 1.数据请求 Ajax四部曲</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">getData</span>(<span class="params">url</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">let</span> xhr = <span class="keyword">new</span> XMLHttpRequest();</span><br><span class="line">    xhr.open(<span class="string">&quot;get&quot;</span>, url);</span><br><span class="line">    xhr.onreadystatechange = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">        <span class="keyword">if</span> (xhr.readyState == <span class="number">4</span> &amp;&amp; xhr.status == <span class="number">200</span>) &#123;</span><br><span class="line">            data = <span class="built_in">JSON</span>.parse(xhr.responseText);</span><br><span class="line">            BindHtml(data);</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;;</span><br><span class="line">    xhr.send();</span><br><span class="line">&#125;</span><br><span class="line">getData(<span class="string">&quot;data/data.json&quot;</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 2.渲染li</span></span><br><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">BindHtml</span>(<span class="params">data</span>) </span>&#123;</span><br><span class="line">    <span class="keyword">var</span> str = <span class="string">&quot;&quot;</span>;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; data.length; i++) &#123;</span><br><span class="line">        <span class="keyword">const</span> el = data[i];</span><br><span class="line">        str += <span class="string">`&lt;li time=&quot;<span class="subst">$&#123;el.time&#125;</span>&quot; price=&quot;<span class="subst">$&#123;el.price&#125;</span>&quot; hot=&quot;<span class="subst">$&#123;el.hot&#125;</span>&quot;&gt;</span></span><br><span class="line"><span class="string">        &lt;img src=&quot;<span class="subst">$&#123;el.img&#125;</span>&quot; alt=&quot;&quot;&gt;</span></span><br><span class="line"><span class="string">        &lt;p class=&quot;title&quot;&gt;<span class="subst">$&#123;el.title&#125;</span>&lt;/p&gt;</span></span><br><span class="line"><span class="string">        &lt;p class=&quot;time&quot;&gt;<span class="subst">$&#123;el.time&#125;</span>&lt;/p&gt;</span></span><br><span class="line"><span class="string">        &lt;p class=&quot;numInfo&quot;&gt;</span></span><br><span class="line"><span class="string">            &lt;span class=&quot;price&quot;&gt;<span class="subst">$&#123;el.price&#125;</span>&lt;/span&gt;</span></span><br><span class="line"><span class="string">            &lt;span class=&quot;hot&quot;&gt;<span class="subst">$&#123;el.hot&#125;</span>&lt;/span&gt;</span></span><br><span class="line"><span class="string">        &lt;/p&gt;</span></span><br><span class="line"><span class="string">    &lt;/li&gt;`</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    lists.innerHTML = str;</span><br><span class="line">    lis = [].slice.call(lis);</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 3.给link绑定事件</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; links.length; i++) &#123;</span><br><span class="line">    links[i].flag = -<span class="number">1</span>;</span><br><span class="line">    links[i].onclick = <span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">        <span class="keyword">let</span> that = <span class="built_in">this</span>;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; links.length; i++) &#123;</span><br><span class="line">            <span class="keyword">if</span> (links[i] != <span class="built_in">this</span>) &#123;</span><br><span class="line">                links[i].flag = -<span class="number">1</span>;</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="built_in">this</span>.flag *= -<span class="number">1</span>;</span><br><span class="line">        <span class="keyword">let</span> sortFlag = <span class="built_in">this</span>.getAttribute(<span class="string">&quot;sortFlag&quot;</span>);</span><br><span class="line">        <span class="keyword">let</span> arrows = <span class="built_in">this</span>.querySelectorAll(<span class="string">&quot;b&quot;</span>);</span><br><span class="line">        <span class="keyword">let</span> arrCur = <span class="built_in">document</span>.querySelectorAll(<span class="string">&quot;b.current&quot;</span>);</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; arrCur.length; i++) &#123;</span><br><span class="line">            arrCur[i].classList.remove(<span class="string">&quot;current&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">if</span> (<span class="built_in">this</span>.flag == <span class="number">1</span>) &#123;</span><br><span class="line">            arrows[<span class="number">0</span>].classList.add(<span class="string">&quot;current&quot;</span>);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            arrows[<span class="number">1</span>].classList.add(<span class="string">&quot;current&quot;</span>);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">let</span> frg = <span class="built_in">document</span>.createDocumentFragment();</span><br><span class="line">        <span class="keyword">if</span> (sortFlag == <span class="string">&quot;time&quot;</span>) &#123;</span><br><span class="line">            lis.sort(<span class="function"><span class="keyword">function</span> (<span class="params">a, b</span>) </span>&#123;</span><br><span class="line">                <span class="keyword">return</span> (a.getAttribute(sortFlag).replace(<span class="regexp">/-/g</span>, <span class="string">&quot;&quot;</span>) - b.getAttribute(sortFlag).replace(<span class="regexp">/-/g</span>, <span class="string">&quot;&quot;</span>)) * that.flag;</span><br><span class="line">            &#125;);</span><br><span class="line">        &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">            lis.sort(<span class="function"><span class="keyword">function</span> (<span class="params">a, b</span>) </span>&#123;</span><br><span class="line">                <span class="keyword">return</span> (a.getAttribute(sortFlag) - b.getAttribute(sortFlag)) * that.flag;</span><br><span class="line">            &#125;);</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; lis.length; i++) &#123;</span><br><span class="line">            frg.appendChild(lis[i]);</span><br><span class="line">        &#125;</span><br><span class="line">        lists.appendChild(frg);</span><br><span class="line">    &#125;;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

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